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incubator-nuttx/drivers/input/stmpe811.h

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/********************************************************************************************
* drivers/input/stmpe811.h
*
* Copyright (C) 2012, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References:
* "STMPE811 S-Touch advanced resistive touchscreen controller with 8-bit
* GPIO expander," Doc ID 14489 Rev 6, CD00186725, STMicroelectronics"
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
********************************************************************************************/
#ifndef __DRIVERS_INPUT_STMPE811_H
#define __DRIVERS_INPUT_STMPE811_H
/********************************************************************************************
* Included Files
********************************************************************************************/
#include <nuttx/config.h>
#include <nuttx/semaphore.h>
#include <nuttx/wdog.h>
#include <nuttx/clock.h>
#include <nuttx/wqueue.h>
#include <nuttx/input/stmpe811.h>
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE811)
/********************************************************************************************
* Pre-processor Definitions
********************************************************************************************/
/* Configuration ****************************************************************************/
/* Reference counting is partially implemented, but not needed in the current design. */
#undef CONFIG_STMPE811_REFCNT
/* No support for the SPI interface yet */
#ifdef CONFIG_STMPE811_SPI
# error "Only the STMPE811 I2C interface is supported by this driver"
#endif
/* Driver support ***************************************************************************/
/* This format is used to construct the /dev/input[n] device driver path. It defined here
* so that it will be used consistently in all places.
*/
#define DEV_FORMAT "/dev/input%d"
#define DEV_NAMELEN 16
/* STMPE811 Resources ***********************************************************************/
#ifndef CONFIG_STMPE811_TSC_DISABLE
# define STMPE811_ADC_NPINS 4 /* Only pins 0-3 can be used for ADC */
# define STMPE811_GPIO_NPINS 4 /* Only pins 0-3 can be used as GPIOs */
#else
# define STMPE811_ADC_NPINS 8 /* All pins can be used for ADC */
# define STMPE811_GPIO_NPINS 8 /* All pins can be used as GPIOs */
#endif
/* Driver flags */
#define STMPE811_FLAGS_TSC_INITIALIZED (1 << 0) /* 1: The TSC block has been initialized */
#define STMPE811_FLAGS_GPIO_INITIALIZED (1 << 1) /* 1: The GIO block has been initialized */
#define STMPE811_FLAGS_ADC_INITIALIZED (1 << 2) /* 1: The ADC block has been initialized */
#define STMPE811_FLAGS_TS_INITIALIZED (1 << 3) /* 1: The TS block has been initialized */
/* Timeout to detect missing pen up events */
#define STMPE811_PENUP_TICKS MSEC2TICK(100)
/********************************************************************************************
* Public Types
********************************************************************************************/
/* This describes the state of one contact */
enum stmpe811_contact_3
{
CONTACT_NONE = 0, /* No contact */
CONTACT_DOWN, /* First contact */
CONTACT_MOVE, /* Same contact, possibly different position */
CONTACT_UP, /* Contact lost */
};
/* This structure describes the results of one STMPE811 sample */
struct stmpe811_sample_s
{
uint8_t id; /* Sampled touch point ID */
uint8_t contact; /* Contact state (see enum stmpe811_contact_e) */
bool valid; /* True: x,y,z contain valid, sampled data */
uint16_t x; /* Measured X position */
uint16_t y; /* Measured Y position */
uint8_t z; /* Measured Z index */
};
/* This structure represents the state of the STMPE811 driver */
struct stmpe811_dev_s
{
#ifdef CONFIG_STMPE811_MULTIPLE
FAR struct stmpe811_dev_s *flink; /* Supports a singly linked list of drivers */
#endif
/* Common fields */
FAR struct stmpe811_config_s *config; /* Board configuration data */
sem_t exclsem; /* Manages exclusive access to this structure */
#ifdef CONFIG_STMPE811_SPI
FAR struct spi_dev_s *spi; /* Saved SPI driver instance */
#else
FAR struct i2c_master_s *i2c; /* Saved I2C driver instance */
#endif
uint8_t inuse; /* STMPE811 pins in use */
uint8_t flags; /* See STMPE811_FLAGS_* definitions */
struct work_s work; /* Supports the interrupt handling "bottom half" */
/* Fields that may be disabled to save size if touchscreen support is not used. */
#ifndef CONFIG_STMPE811_TSC_DISABLE
#ifdef CONFIG_STMPE811_REFCNT
uint8_t crefs; /* Number of times the device has been opened */
#endif
uint8_t nwaiters; /* Number of threads waiting for STMPE811 data */
uint8_t id; /* Current touch point ID */
uint8_t minor; /* Touchscreen minor device number */
volatile bool penchange; /* An unreported event is buffered */
uint16_t threshx; /* Thresholded X value */
uint16_t threshy; /* Thresholded Y value */
sem_t waitsem; /* Used to wait for the availability of data */
struct work_s timeout; /* Supports tiemeout work */
struct wdog_s wdog; /* Timeout to detect missing pen down events */
struct stmpe811_sample_s sample; /* Last sampled touch point data */
/* The following is a list if poll structures of threads waiting for
* driver events. The 'struct pollfd' reference for each open is also
* retained in the f_priv field of the 'struct file'.
*/
struct pollfd *fds[CONFIG_STMPE811_NPOLLWAITERS];
#endif
/* Fields that may be disabled to save size of GPIO support is not used */
#if !defined(CONFIG_STMPE811_GPIO_DISABLE) && !defined(CONFIG_STMPE811_GPIOINT_DISABLE)
stmpe811_handler_t handlers[STMPE811_GPIO_NPINS]; /* GPIO "interrupt handlers" */
#endif
};
/********************************************************************************************
* Public Function Prototypes
********************************************************************************************/
/********************************************************************************************
* Name: stmpe811_getreg8
*
* Description:
* Read from an 8-bit STMPE811 register
*
********************************************************************************************/
uint8_t stmpe811_getreg8(FAR struct stmpe811_dev_s *priv, uint8_t regaddr);
/********************************************************************************************
* Name: stmpe811_putreg8
*
* Description:
* Write a value to an 8-bit STMPE811 register
*
********************************************************************************************/
void stmpe811_putreg8(FAR struct stmpe811_dev_s *priv, uint8_t regaddr, uint8_t regval);
/********************************************************************************************
* Name: stmpe811_getreg16
*
* Description:
* Read 16-bits of data from an STMPE-11 register
*
********************************************************************************************/
uint16_t stmpe811_getreg16(FAR struct stmpe811_dev_s *priv, uint8_t regaddr);
/********************************************************************************************
* Name: stmpe811_tscint
*
* Description:
* Handle touchscreen interrupt events (this function actually executes in the context of
* the worker thread).
*
********************************************************************************************/
#ifndef CONFIG_STMPE811_TSC_DISABLE
void stmpe811_tscworker(FAR struct stmpe811_dev_s *priv, uint8_t intsta) weak_function;
#endif
/********************************************************************************************
* Name: stmpe811_gpioworker
*
* Description:
* Handle GPIO interrupt events (this function actually executes in the context of the
* worker thread).
*
********************************************************************************************/
#if !defined(CONFIG_STMPE811_GPIO_DISABLE) && !defined(CONFIG_STMPE811_GPIOINT_DISABLE)
void stmpe811_gpioworker(FAR struct stmpe811_dev_s *priv) weak_function;
#endif
#endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE811 */
#endif /* __DRIVERS_INPUT_STMPE811_H */
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